Vacuum packing envelope for cooking

ABSTRACT

The vacuum packing envelope for cooking which is characterized in that a sealing part ( 110 ) having a certain width is formed for vacuum packing food by heating and thermally melting a film, and a vapor discharge part ( 130 ) which is disposed at a portion of the sealing rim part ( 110 ) for automatically discharging vapor with the aid of an inner pressure when heating and cooking food, comprises an easy peel tape ( 120 ) which crosses, in a horizontal direction, the sealing rim part; and a vapor discharge part ( 130 ) which is formed in the sealing weak part ( 111 ) where the easy peel tape ( 120 ) and the sealing rim part ( 110 ) overlap with each other.

TECHNICAL FIELD

The present invention relates to a vacuum packing envelope for cooking,and in particular to a vacuum packing envelope for cooking which can beused for the purposes of various applications with the aid of easierpressure controls and makes it possible to prevent an operation error ofa vapor discharge part in such a way that an easy peel tape horizontallycrossing a sealing rim part is formed, and a vapor discharge part isformed in a sealing weakening part where the easy peel tape and thesealing rim part overlap with each other.

BACKGROUND ART

When a packing envelope sealingly filled with a retort food, a frozenfood or something is heated in a microwave oven, the pressure of theenvelope rises by the vapor coming from the stuff as it is heated, andthe packing envelope might explode, and the stuff flies. As a containeris destroyed, the inner side of the microwave over might be messed up ora user might have a burn injury.

In order to prevent the above problems, it is needed to partially open apacking envelope before it is hated in the microwave oven or a hole ismade at the body of the packing envelope, thus discharging vapor comingfrom the packing envelope to the outside, whereby to prevent the destroyof the packing envelope.

The above method takes an ordinary user a long time to use. When theabove method is actually applied, since the vapor generating due to theheating in the microwave oven is instantly discharged to the outside ofthe packing envelope, the stuff to be heated and cooked might lose aheating and steaming effect, which results in the bad taste of the food.

As another conventional art for resolving the problems encountered inthe conventional art, there is a Korean patent publication number10-2008-0007647 entitled the packing envelope for a microwave oven.

FIGS. 1 a and 1 b are schematic views illustrating a conventionalpacking envelope for a microwave oven.

The conventional packing envelope 1 is characterized in that an outersealing part 3 is formed at a corner part, and a no-sealing part 4 isformed near the outer sealing part 3, and a vapor discharge sealing part6 formed by a weakening part 5 by means of a heart shaped through holeformed in the no-sealing part 4 is connected to an edge sealing part 2.In addition, a notch 7 is formed near an upper side of the edge sealingpart 2 for the purpose of opening the packing envelope 1 after it isheated in a microwave oven.

The weakening part 5 is configured in such a manner that the widthgradually increases from an upper side, which is to open, to a rearside. A protrusion part 51 is formed from the rear side to the innerside of the weakening part 5. The rear side of the weakening part 5 ispartitioned into two parts 52 and 53.

As shown in FIGS. 1 a and 1 b, the vapor discharge sealing part 6 of thepacking envelope 1 is configured in such a manner that the initial cutpoint B of the vapor discharge sealing part 6 is positioned on a circleR with the radius corresponding to the distance PA from the centralpoint P of the packing envelope to the center of the inner end of theedge sealing part by adapting, as a reference point, the central point(P: hereinafter referred to the central point P) coming into innercontact with the center of the inner end of the edge sealing part of twoshort sides of the packing envelope.

Here, the initial cut point B of the vapor discharge sealing part 6represents the point where the outer sealing part 3 starts opening atthe vapor discharge sealing part 6 when the packing envelope is heatedin the microwave oven.

The packing envelope of the conventional art is directed to adjustingthe cooking pressure depending on the bonding width and the bindingstrength of the outer sealing part 3, so it is needed to preciselyadjust the bonding width and the binding strength of the sealing part 3,otherwise, the vapor does not discharge at a proper pressure, so theenvelope might explode by the vapor pressure. The vapor might startdischarging too early, so cooking cannot be properly conducted.

DISCLOSURE OF THE INVENTION

Accordingly, it is an object of the present invention to provide avacuum packing envelope for cooking which can be used for the purposesof various applications with the aid of easier pressure controls andmakes it possible to prevent an operation error of a vapor dischargepart in such a way that an easy peel tape horizontally crossing asealing rim part is formed, and a vapor discharge part is formed in asealing weak part where the easy peel tape and the sealing rim partoverlap with each other.

To achieve the above objects, there is provided a vacuum packingenvelope for cooking which is characterized in that a sealing parthaving a certain width is formed for vacuum packing food by heating andthermally melting a film, and a vapor discharge part which is disposedat a portion of the sealing rim part for automatically discharging vaporwith the aid of an inner pressure when heating and cooking food,comprising an easy peel tape which crosses, in a horizontal direction,the sealing rim part; and a vapor discharge part which is formed in thesealing weak part where the easy peel tape and the sealing rim partoverlap with each other.

In addition, the easy peel tape forms a multiplex sealing part which isformed of at least one band.

In addition, the sealing weak part comprises an expanding part whichexpands inwardly in the envelope.

At this time, a vapor discharge part is formed only at a sealing weakpart which forms an expanding part.

In addition, the vapor discharge part is formed in a porous shape.

In addition, the vapor discharge part forms a passage for the sealingweak part to pass through from the inner side to the outer side of theenvelope.

At this time, the vapor discharge part forms a passage from the sealingweak part to pass through from the inner side of the outer side of theenvelope, the outlet part of the passage being expanded to the region ofthe sealing rim part which is out of the sealing weak part.

ADVANTAGEOUS EFFECTS

The present invention is easy to use and the reliability of the productcan be enhanced because it can be used for the purposes of variousapplications with the aid of easier pressure controls, and the presentinvention makes it possible to prevent an operation error of a vapordischarge part in such a way that an easy peel tape horizontallycrossing a sealing rim part is formed, and a vapor discharge part isformed in a sealing weakening part where the easy peel tape and thesealing rim part overlap with each other.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will become better understood with reference tothe accompanying drawings which are given only by way of illustrationand thus are not limitative of the present invention, wherein;

FIG. 1 is a schematic view illustrating a conventional packing envelopefor cooking;

FIG. 2 is a schematic view illustrating a vacuum packing envelope forcooking according to an embodiment of the present invention;

FIG. 3 is a cross sectional view taken along line A-A of FIG. 2;

FIGS. 4A and 4B are cross sectional views illustrating an example that avacuum packing envelope for cooking is expanded by means of a vaporpressure according to the present invention;

FIG. 5 is an enlarged view illustrating a sealing weak part according tothe present invention;

FIG. 6 is an enlarged view illustrating an example that a sealing weakpart of FIG. 5 is open by means of a vapor pressure;

FIG. 7 is a plane cross sectional view of FIG. 6; and

FIGS. 8 through 12 are schematic views illustrating various examples ofa vacuum packing envelope for cooking according to the presentinvention.

MODES FOR CARRYING OUT THE INVENTION

The preferred embodiments of the present invention will be describedwith reference to the accompanying drawings.

FIG. 2 is a schematic view illustrating a vacuum packing envelope forcooking according to an embodiment of the present invention, FIG. 3 is across sectional view taken along line A-A of FIG. 2, FIGS. 4A and 4B arecross sectional views illustrating an example that a vacuum packingenvelope for cooking is expanded by means of a vapor pressure accordingto the present invention, FIG. 5 is an enlarged view illustrating asealing weak part according to the present invention, FIG. 6 is anenlarged view illustrating an example that a sealing weak part of FIG. 5is open by means of a vapor pressure, and FIG. 7 is a plane crosssectional view of FIG. 6.

As shown in FIG. 2, there is provided a vacuum packing envelope 100 forcoking which is characterized in that a sealing rim part 110 with acertain width is formed for the purpose of vacuum packing food bythermally melting a film, and a vapor discharge part 130 is formed at aportion of the sealing rim part 110 for the purpose of automaticallydischarging vapor by means of the inner pressure when cooling food.

Here, the film might be formed of a plastic stacked film, and thethermoplastic resin having a heating and sealing property forming theplastic static film is formed of one selected from the group consistingof an olefin resin formed of a low density polyethylene, a linear lowdensity polyethylene, a middle density polyethylene, a high densitypolyethylene, a polypropylene, a propylene-ethylene copolymer, anethylene-acetic acid vinyl copolymer, an ethylene unsaturated carboxylicacid and an olefin resin which is graft-transformed anhydride, apolyamide to co-polyamide which has a relatively low melting point or alow softening point, a polyester to co-polyester resin and a polycarbonate resin.

In addition, the other plastic material stacked with a thermoplasticresin with a heating and sealing property might be formed of athermoplastic resin which has a heating and sealing property or does nothave the same.

As the thermoplastic resins, there are poly olefin vinyl such ascrystalline poly propylene, crystalline propylene-ethylene copolymer,crystalline poly butene-1, crystalline poly 4-methyl pentene-1, lowdensity, middle density or high density polyethylene, ethylene-aceticacid vinyl copolymer (EVA), EVA hydrolysate, ethylene-acryl acid ethylcopolymer (EEA), ion cross-linking olefin copolymer (ionomer), etc;aromatic vinyl copolymer such as polystyrene, styrene-butadienecopolymer, etc; halogenation vinyl copolymer such as vinylidene chlorideresin, etc; poly acryl resin; nitrile copolymer such as acryl nitrilestyrene copolymer, acryl nitrile styrene butadiene copolymer; polyestersuch as poly ethylene telephthalate, poly tetramethylene phthalate, etc;various poly carbonate; fluorine resins; polyacetal such aspolyoxymethylene.

The above thermoplastic resin might be used in a singular form or mightbe used in a combination with at least two components or might be usedby adding various additives to the thermoplastic resins.

The plastic stacked film used in the present invention might be formedby sacking, in a known method, a non-stretchable or a single axial orbiaxial stretchable film made from a resin which has a heating sealingproperty or does not have the same.

The present invention is directed to a vacuum packing envelope formicrowave oven made by heating and sealing the above plastic stackedfilm in a known method. In case that a stacked film of a thermoplasticresin having a heating and sealing property and a thermoplastic resinnot having a heating and sealing property, it is needed to heat and sealthe thermoplastic resins to be inner sides, the thermoplastic resinshaving a heating and sealing property.

The packing envelope made from the above material has a vapor dischargepart 130 at the sealing rim part 110 for discharging vapor generating bythe inner pressure when heating food.

Here, an easy peel tape 120 is formed horizontally crossing the sealingrim part 110. The vapor discharge part 130 is formed in the sealing weakpart 111 where the easy peel tape 120 and the sealing rim part 110overlap with each other.

Here, the easy peel tape 120 is made of an easy peel film which is easyto seal and peel off in an easier way.

The vapor discharge part 130 might be formed of a porous shape.

A cut line 140 might be formed in a horizontal direction at an upperside where the easy peel tape 120 is formed.

The oration of the present invention will be described.

An instant food to be cooked simply using a microwave oven or thesomething is inputted into the vacuum packing envelope 100 for cookingaccording to the present invention.

The user what wants to cook the packed food inputs the packing envelope100 into a microwave oven and heats the same.

As the food in the packing envelope 100 emits vapor during the cooking,and a pressure generates therein.

As shown in FIGS. 4A and 4B, the easy peel tape 120 is separated bymeans of the pressure. At this time, the easy peel tape 120 might beformed at both sides of the packing envelope or might be formed at oneside of the same.

As shown in FIGS. 6 and 7, the sealing weak part 111 gradually opens,and the vapor discharge part 130 gradually opens, thus dischargingvapor.

At this time, the width of the easy peel tape 120 might be 30˜60 mm. Thecooking pressure can be adjusted by adjusting the width of the easy peeltape 120.

In case of porridge, since the cooking time is short, and it is neededto discharge vapor to even lower pressure, the width is adjustedsmaller, but in case of rice, since the cooking time takes long, and itis needed to discharge vapor to relatively higher pressure, the width isadjusted larger.

FIGS. 8 to 12 are schematic views illustrating various examples of thevacuum packing envelope for cooking according to the present invention.

FIG. 8 is a view of an example of a multiplex sealing part 121 having atleast one band at the easy peel tape 120, and FIGS. 9 to 12 are viewsillustrating an expanding part which is formed at the sealing weak part111 and is expanded inwardly in the envelope.

At this time, a vapor discharge part 130 might be formed only at thesealing weak part 111 which forms the expanding part.

FIGS. 11 and 12 are views illustrating an example that a passage for thevapor discharge part 130 to pass through from the inner side of thesealing weak part 111 to the outside of the envelope. FIG. 12 is a viewof an example that the outlet side of the passage is extended to theregion of the sealing rim part 110 which is out of the sealing weak part111.

As described above, the present invention can be used for the purposesof various applications with the aid of easier pressure controls andmakes it possible to prevent an operation error of a vapor dischargepart in such a way that an easy peel tape horizontally crossing asealing rim part is formed, and a vapor discharge part is formed in asealing weakening part where the easy peel tape and the sealing rim partoverlap with each other.

As the present invention may be embodied in several forms withoutdeparting from the spirit or essential characteristics thereof, itshould also be understood that the above-described examples are notlimited by any of the details of the foregoing description, unlessotherwise specified, but rather should be construed broadly within itsspirit and scope as defined in the appended claims, and therefore allchanges and modifications that fall within the meets and bounds of theclaims, or equivalences of such meets and bounds are therefore intendedto be embraced by the appended claims.

What is claimed is:
 1. A vacuum packing envelope for cooking which is characterized in that a sealing part (110) having a certain width is formed for vacuum packing food by heating and thermally melting a film, and a vapor discharge part (130) which is disposed at a portion of the sealing rim part (110) for automatically discharging vapor with the aid of an inner pressure when heating and cooking food, comprising: an easy peel tape (120) which crosses, in a horizontal direction, the sealing rim part; and a vapor discharge part (130) which is formed in the sealing weak part (111) where the easy peel tape (120) and the sealing rim part (110) overlap with each other.
 2. The envelope of claim 1, wherein said easy peel tape (120) forms a multiplex sealing part (121) which is formed of at least one band.
 3. The envelope of claim 1, wherein said sealing weak part (111) comprises an expanding part which expands inwardly in the envelope.
 4. The envelope of claim 3, wherein a vapor discharge part (130) is formed only at a sealing weak part (111) which forms an expanding part.
 5. The envelope of claim 1, wherein said vapor discharge part (130) is formed in a porous shape.
 6. The envelope of claim 1, wherein said vapor discharge part (130) forms a passage for the sealing weak part (111) to pass through from the inner side to the outer side of the envelope.
 7. The envelope of claim 6, wherein said vapor discharge part (130) forms a passage from the sealing weak part (111) to pass through from the inner side of the outer side of the envelope, the outlet part of the passage being expanded to the region of the sealing rim part (110) which is out of the sealing weak part (111). 